Abstract
Human thymocytes bearing T3 but neither T4 nor T8 antigens (T3+4-8- cells) were obtained after negative selection of thymocytes, either fresh or cultured in medium containing recombinant interleukin 2 (IL-2), by treatment with Na1/34, OKT4A and B9.4 monoclonal antibodies (which recognize T6, T4, and T8 antigens, respectively) and complement. Quantitative flow cytometry showed a 98% pure population of T3+4-8- lymphocytes, which included proliferating cells. The growth and maturation requirements of these thymocytes were characterized and related to the T3-receptor complex and IL-2 pathways, thought to be used by mature lymphocytes. The results show that addition of recombinant IL-2 promotes, in a dose-dependent way, proliferation and acquisition of effector functions by cultured T3+4-8- thymocytes, the growth being inhibitable by monoclonal antibody 33B73 (anti-Tac). Furthermore, cytolytic activity of T3+4-8- cells induced by recombinant IL-2 is specifically blocked by monoclonal antibody OKT3, showing that it operates via the T3-receptor complex and does not require either T4 or T8 molecules. The finding of in vitro responsiveness to recombinant IL-2 in T3+4-8- thymocytes suggests a role of IL-2 in the growth and maturation of cells committed to the T-cell lineage, during intrathymic differentiation, prior to expression of T4 and T8 molecules.
MeSH Terms
Antibodies, Monoclonal
Antigens, Differentiation, T-Lymphocyte
Antigens, Surface/immunology
Cell Differentiation
Cell Division
Flow Cytometry
Humans
Interleukin-2/physiology
Receptors, Antigen, T-Cell/immunology
Receptors, Immunologic/immunology
Receptors, Interleukin-2
T-Lymphocytes, Cytotoxic/cytology,immunology
Thymus Gland/cytology,immunology
Chemicals
Antibodies, Monoclonal
Antigens, Differentiation, T-Lymphocyte
Antigens, Surface
Interleukin-2
Receptors, Antigen, T-Cell
Receptors, Immunologic
Receptors, Interleukin-2
Authors & Affiliations
4 authors, click to expand affiliations / ORCID
de la Hera A
Toribio M L
Marquez C
Martinez C
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